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Java核心技术 4.2.3代码练习

package main;

import java.time.LocalDate;

public class CalendarTest {
    private static void printCalendar(LocalDate now) {
        String header = "Mon Tue Wed Thu Fri Sat Sun";
        System.out.println(header);
        LocalDate firstDayOfMonth = now.withDayOfMonth(1);
        LocalDate lastDayOfMonth = now.withDayOfMonth(now.lengthOfMonth());
        LocalDate firstDayOfFirstWeek = firstDayOfMonth.minusDays(firstDayOfMonth.getDayOfWeek().getValue() - 1);
        LocalDate current = firstDayOfFirstWeek;
        while (current.compareTo(lastDayOfMonth) <= 0) {
            String temp;
            if (current.isBefore(firstDayOfMonth)) {
                temp = "   ";
            } else {
                temp = String.format("%3d", current.getDayOfMonth());
            }
            if (current.isEqual(now)) {
                temp = temp + "*";
            } else {
                temp = temp + " ";
            }
            System.out.print(temp);
            if (current.getDayOfWeek().getValue() == 7) {
                System.out.print("\n");
            }
            current = current.plusDays(1);
        }
    }

    public static void main(String[] args) {
        LocalDate now = LocalDate.of(2021, 10, 24);
        printCalendar(now);
    }
}

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